NDLI: Ultraviolet laser scattering in atmospheric microdischarges

Content Provider	IEEE Xplore Digital Library
Author	Adams, S.F. Caplinger, J.E. Williamson, J.M.
Copyright Year	2012
Description	Author affiliation: UES Inc., Dayton, OH 45432 USA (Caplinger, J.E.; Williamson, J.M.) \|\| Air Force Research Laboratory, AFRL/RQPE, 1950 Fifth St., Wright Patterson AFB, OH 45433 USA (Adams, S.F.)
Abstract	Spatially resolved temperature measurements within a microdischarge in atmospheric pressure air have been conducted using Rayleigh and Raman scattering of a pulsed ultraviolet laser. The Rayleigh scattering analyses utilized spatially resolved time-gated imaging of the interaction region of the microdischarge and laser. Optical filtering of the collected Rayleigh signal minimized noise due to the elastic background component, including stray reflections, which often hinder such imaging. A single Rayleigh intensity image across the dc discharge produced a radial profile of translational temperature, with the analysis based on the ideal gas inverse relationship of temperature with the gas target density. The alternative technique using the vibrational Raman shifted signal benefited from being spectrally removed from the laser source background scatter noise, but the signal was several orders of magnitude less in intensity than Rayleigh scattering. The Raman analysis method involved monitoring Q-branch signals originating from multiple N(X) vibrational states populated in the microdischarge, which allowed assignment of translational and vibrational temperatures. Rotational temperature was analyzed from the structure of the S and O branches. The Raman technique also was capable of generating a spatially resolved temperature profile with multiple spectra by translating the laser through the microdischarge. Both Rayleigh and Raman scattering results are compared to passive optical emission spectral analyses of the N second positive system from the microdischarge where the rotational and vibrational temperatures of the N(C) excited state were calculated. A comparison of the N(X) and N(C) temperatures derived from laser scattering and emission spectroscopy, respectively, is presented.
File Size	178005
File Format	PDF
ISBN	9781457721274
ISSN	07309244
e-ISBN	9781457721298
e-ISBN	9781457721281
DOI	10.1109/PLASMA.2012.6383923
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2012-07-08
Publisher Place	United Kingdom
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Measurement by laser beam Spatial resolution Signal resolution Raman scattering Laser noise Atmospheric measurements
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Condensed Matter Physics Electrical and Electronic Engineering

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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